Shimano Ultegra-6500 2x9sp chainring, 130BCD - B53t Bolt Pattern: 5-BoltChain Compatibility: 9-SpeedChainring BCD: 130mmChainring BCD: 130mmChainring Speeds: 2x9spChainrings Material: AluminumComponent Color: SilverMax Teeth: 53tPosition: OuterTooth: 53t